Explanation

In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes.

DNA stands for Deoxyribonucleic Acid.

Explanation

Photosynthesis takes place in the chloroplast.

The chlorophyll present in the chloroplast traps the light from the sun and carries out the process.

Explanation

A contour line is a line drawn on a topographic map to indicate ground elevation or depression.

Explanation

Vitamin A deficiency can cause both loss of appetite and night blindness.

It is also known to increase susceptibility to infections, including those in the throat. 

Night blindness

This is one of the earliest signs of vitamin A deficiency.

It is the inability to see well in low-light conditions, which is caused by the lack of a specific pigment needed for the retina to function properly. 

Loss of appetite

Vitamin A is involved in the health of the receptors for taste and smell.

When vitamin A is deficient, these senses can be altered, which leads to a reduced appetite and difficulty consuming enough nutrients. 

Explanation

• the planet that moves around the Sun at the largest speed is Mercury
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• Mercury is the fastest planet, which speeds around the sun at 47.87 km/s.
• In miles per hour, this equates to a whopping 107,082 miles per hour.

Explanation

Leather is a durable and flexible material created by tanning animal rawhide and skins.

The major ingredient of leather is Collagen.

 Leather can be used to make a variety of items, including

• clothing,
• footwear,
• handbags,
• furniture,
• tools 
• sports

SH10-8-2023

Explanation

Relative Humidity Depends on temperature, weather, and location

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Humidity in the air was measured by a Hygrometer

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Concept Of Humidity: Important Information: Please read Carefully 

Humidity is the presence of water vapor in the atmosphere.

The higher the rate of temperatures, weather, and (hot) place tend to be the more water vapor rises into the air, and the more humidity that area is.

The lower the rate of temperatures, weather, and (cold) places tend to be the less water vapor rises into the air, and the less humidity that area is. 

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Explanation

Photochemical smog which is mainly composed of ozone (O3), Peroxyacetyl nitrate (PAN) and Nox, is also known as ‘brown air’ where solar radiation is intense.

In seasons of lesser solar radiation or areas, smog formation is incomplete and the air is referred to as grey air.

Explanation

The sand commonly used to make glass is comprised of small grains of quartz crystals, made up of molecules of silicon dioxide, which is also known as silica.

Explanation

Agrostology, the branch of botany concerned with the study of grasses, especially their classification.

Agrostology means مطالعہ گھاس